GPT-6.1 Sol (Low) vs GPT-6 Luna (Low)

Which is better for the money: GPT-6.1 Sol (Low) by OpenAI or GPT-6 Luna (Low) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-27.

Trade-off

OpenAIGPT-6.1 Sol (Low)Off the frontier

Intelligence: 42.10
Total cost: $250

OpenAIGPT-6 Luna (Low)On the frontier

Intelligence: 21.50
Total cost: $10.6

Verdict

Depends on your budget

GPT-6.1 Sol (Low) scores 20.6 points higher (42.1 vs 21.5) but costs 24× as much to run the benchmark ($250 vs $10.6; mid-range vs budget cost classes). They are not alternatives at one budget: pick GPT-6.1 Sol (Low) when you need intelligence above 21.5, and GPT-6 Luna (Low) when 21.5 is enough.

Metric	GPT-6.1 Sol (Low)	GPT-6 Luna (Low)	Difference
Intelligence (higher is better)	42.1	21.5	−48.9% GPT-6 Luna (Low) is 48.9% less intelligent
Total AA cost (lower is better)	$250.48	$10.63	−95.8% GPT-6 Luna (Low) is 95.8% cheaper
End-to-end time (lower is better)	11.89s	6.99s	−41.2% GPT-6 Luna (Low) is 41.2% faster
Price per 1M tokens (in / out)	$2.00 / $10.0	$0.10 / $0.50
Input modalities	Text, Image	Text, Image

GPT-6 Luna (Low) vs GPT-6.1 Sol (Low): 48.9% less intelligence, 95.8% less cost to run the AA benchmark, and 41.2% faster end-to-end.

Open this matchup in the interactive picker GPT-6.1 Sol (Low): what beats it GPT-6 Luna (Low): what beats it

Today's Pareto frontier

Against the frontier

GPT-6.1 Sol (Low) is off the frontier: at the same or lower cost, MiMo-V2.6-Pro scores 46.30 for $207.
GPT-6 Luna (Low) is on today's frontier: nothing is both smarter and cheaper.

GPT-6.1 Sol (Low)GPT-6 Luna (Low)Today's Pareto frontierEvery other model

Matchup

Compare something else

Agents: Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-6-1-sol-low/gpt-6-luna-low · Markdown: /api/v1/compare/gpt-6-1-sol-low/gpt-6-luna-low?format=md · llms.txt · agent skill